Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd744216bdb1eed7…

MALICIOUS

PDF

38.5 KB Created: 2020-10-05 13:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: d07413ccd09e9be32c8ab1d4c5dd05d1 SHA-1: 50bf0f5a5d7d7228520a5664c20c90ebf4660177 SHA-256: bd744216bdb1eed72eeb152adca4fc15d387f49ba98498e94de2cbdc7125d417
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/strik?keyword=mitosis+in+an+onion+root+worksheet+answers In PDF document text
    • http://files.thisnthattoollc.com/uploads/1/3/1/4/131453268/negotefuwowur_nupak_gokojufereval_jipuzida.pdfIn PDF document text
    • http://files.dysonundergraduatecouncil.org/uploads/1/3/0/7/130738504/lamemosiwoxoram.pdfIn PDF document text
    • http://files.lesleyrosochodski.com.au/uploads/1/3/0/8/130814209/8946418.pdfIn PDF document text
    • http://lajexu.conleysmartialarts.net/uploads/1/3/1/6/131636698/979882.pdfIn PDF document text
    • http://files.uslsawr.org/uploads/1/3/0/9/130969631/6117416.pdfIn PDF document text
    • http://rafose.haciendasonoma.com/uploads/1/3/1/0/131071117/d84cf2bb9d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5772/3030/files/sorosewoxubumole.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2177/0656/files/belkin_f5d7230_4_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4899/2930/files/jebejimifafinun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/there_is_there_are_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/9302/8761/files/z-line_designs_tv_stand_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/9874/5253/files/how_to_summon_the_grim_reaper_in_sims_3.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A60 4904 bytes
SHA-256: 8a989431419486b9a2e61bc99a4bf35855d18b5077534dc3990ed9acc18490b3
font_01_sfnt_off00006b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B24 10000 bytes
SHA-256: 6d5b95d4e390a9000180d3f553f1e56a5670cf5a16510a2e81b8bb1d82f9e2d7